The evolution of the NFL:
Take a look at how the NFL has evolved from its humble roots, and the efforts being made to ensure it continues to grow.

Those bridges now are on the immediate horizon. The Detroit Free Press recently confirmed Best isn't expected to play football again after suffering four concussions dating back to his final year at Cal.

Already turning the page on his 2010 first-round draft pick, Detroit Lions general manager Martin Mayhew now is looking for "that shifty back that can come in and be that change-of-pace guy who can catch passes out of the backfield."